Short

The main rule of short notation it that it is only two characters in a series.

Because it is so short, it can be used anywhere and in the place of other notations. Since short is also #concise, a documenter can use it in many places to improve readability where other #detailed notations might not be #quick enough to the reader.

Visual

While being #casual, short can have a visually expressive syntax using variations of two character smiley faces.

:], r:, :p, :(, :>

Semantic

However, short doesn't always have to use smiley faces, instead a documenter can use a short counting system.

1 - 4
. : .: ::

Mood Short

A documenter can use a two character mood as well. However, when using mood short it's almost documented as some type of #quick reaction.

+☴
-☴

☴☴ this is also acceptable short